If the United States had built more homes for poor people in 1955 , the housing problems now in some parts of the country______s

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问题 If the United States had built more homes for poor people in 1955 , the housing problems now in some parts of the country______so serious.

选项 A、wouldn’t be
B、wouldn’t have been
C、will not be
D、would have not been

答案A

解析 本句使用了虚拟语气,但要注意的是:在这里从句使用过去完成时,表示对一般过去条件的虚拟;而主句使用一般过去时,表示对一般现在情况的虚拟。做题时,注意到主句中的now是很重要的。
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